/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017 Osimis, Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "ILayerSource.h"

namespace OrthancStone
{
  class LayerSourceBase : public ILayerSource
  {
  private:
    IObserver*  observer_;
    bool        started_;

  protected:
    bool IsStarted()
    {
      return started_;
    }

    void NotifyGeometryReady();
    
    void NotifySourceChange();

    void NotifySliceChange(const SliceGeometry& slice);

    // Takes ownership of "layer" (that cannot be "NULL")
    void NotifyLayerReady(ILayerRenderer* layer,
                          const SliceGeometry& viewportSlice);
    
    void NotifyLayerError(const SliceGeometry& viewportSlice);

    virtual void StartInternal() = 0;

  public:
    LayerSourceBase() :
      observer_(NULL),
      started_(false)
    {
    }
    
    virtual void SetObserver(IObserver& observer);

    virtual void Start();
  };
}